OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

ifcvt.c (noce_try_store_flag_constants): Test for overflow in computing DIFF.

Browse Source 
* ifcvt.c (noce_try_store_flag_constants): Test for overflow
        in computing DIFF.

From-SVN: r47374
This commit is contained in:
Richard Henderson 2001-11-27 01:07:59 -08:00 committed by Richard Henderson
parent d99b0e7965
commit 188235dff1
2 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2001-11-27 Richard Henderson <rth@redhat.com>
* ifcvt.c (noce_try_store_flag_constants): Test for overflow
in computing DIFF.
2001-11-27 Zack Weinberg <zack@codesourcery.com>
* cppfiles.c (read_include_file): Add comment.

6
gcc/ifcvt.c
View File

@ -650,6 +650,12 @@ noce_try_store_flag_constants (if_info)
mode = GET_MODE (if_info->x);
ifalse = INTVAL (if_info->a);
itrue = INTVAL (if_info->b);
/* Make sure we can represent the difference between the two values. */
if ((itrue - ifalse > 0)
!= ((ifalse < 0) != (itrue < 0) ? ifalse < 0 : ifalse < itrue))
return FALSE;
diff = trunc_int_for_mode (itrue - ifalse, mode);
can_reverse = (reversed_comparison_code (if_info->cond, if_info->jump)